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    <title>Document</title>
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<script>
    var url = '/create_todo';
    var data = {title: '学习flask'};
    fetch(url, { method: 'POST', body: JSON.stringify(data), headers: new Headers({ 'Content-Type': 'application/json' }) })
    .then(res => res.json())
    .then(response => console.log('Success:', response));
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